You may check what are the results with full hints on all 3 tables for both selects (for count of course in the inner one). I agree that most probably some index might be corrupted, so with full scans you should see the most credible results. Gints On 2012. gada 24. okt., at 22:00, "Ramadoss, Karthik" <Karthik.Ramadoss@xxxxxxxxxxxxxxxx> wrote: > This is probably a simple one but definitely something new for me. -- //www.freelists.org/webpage/oracle-l